#include<stdio.h>
int main()
{
    int a=1,k=2,n=3;
    int diff=n-k;
    if(diff>=0){
                while(k>1)
    {
        k--;
        a=(a<<1) | 1;
    }
    while(diff>=1)
    {
        a=a<<1;
        diff--;
    }
    printf("%d",a);
}
else
printf("value not applicable: %d",a);

    return 0;
}

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